Continuity mistake: Maggie gets downstairs while Henry and her daughter are playing with their phones. The hair goes in front and behind her right shoulder depending on the camera angle. (00:03:00)
Continuity mistake: Michele Riondino has just killed the snitch and is going after the witness, a Chinese woman. He holds her at gunpoint; she does not move, but in a shot she has hair in front of just her left shoulder, both shoulders in the next. (00:30:30)
Continuity mistake: Lynn Jackson collects things from the desk and looks at George Pierce, who tells her "I'll talk to him", clutching his smartphone to his chest. Next shot and his arm is down his side. (00:18:10)
Other mistake: The private investigator has a full size Glock. The Glock 21 which is a .45 ACP has the lowest magazine capacity of 13 rounds. The 9mm capacity for the Glock 17 is 17 rounds. The PI exchanges gun fire and after he fires 7 rounds, his gun runs dry. Makes no sense to bring a half empty gun to a fight, plus he just got it back from his brother-in-law. (01:05:00 - 01:06:00)
Continuity mistake: In the treehouse, the contraption Henry built releases icing in a pile onto the top of the cupcake (or brownie) Peter is holding. When Peter moves the cupcake to his mouth, the icing is evenly spread in the middle. (00:07:04)
Deliberate mistake: The front passenger's side mirror [driver's side is on the right] is parallel to the screen/camera yet there is a perfectly clear image of the passenger's face looking into the mirror. (00:00:38)
Continuity mistake: Addison put his sweater on (over his neck and arms into the sleeves). After his dad asked him if he was OK, the view of Addison in the mirror showed him putting his sweater on again. (00:16:04)